In this section, the complexity of the proposed methods is evaluated against the mentioned state-of-the art approaches considering the same scenario utilized in the previous subsection, \(K=3\)  users \(M=12\)  BS antennas and QPSK data and transmit vector symbols. The complexity of the proposed B&B approaches is measured using the different methods for projection presented in section .
As mentioned before, the proposed methods are evaluated against the state-of-the-art approaches in terms of the runtime. For solving the optimization problems for the methods in [1]}, [2]}, [3]} and for the proposed approaches the optimization toolbox from Matlab was utilized. The optimization problem required for the CVX-CIO approach [4]} was solved via CVX [5]}, as suggested by the authors. The results are shown in Fig. REF .
